Shafiei Mehdi, Khanzadeh Mohammad
Department of Physics, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran.
Opt Express. 2010 Dec 6;18(25):25509-18. doi: 10.1364/OE.18.025509.
Microring tower resonators, which are a chain of microring resonators stacked on top of each other, are of great interest for nonlinear optics due to their unique features such as very high compactness, coupling efficiency and quality factor. In this research, we investigate the optical bistability in microring tower (MRT) with Kerr nonlinearity by using the coupled mode theory, and demonstrate how a proper defect into the structure can lead to low threshold bistability. In particular, we observed optical bistability in nonlinear defect modes with switching power as low as 165 μW through numerical calculations in a structure with a overall loss on the order of 0.01 mm. In addition, we also develop an analytical model that excellently gives the position of defect modes in linear regime.
微环塔谐振器是由相互堆叠的一系列微环谐振器组成，因其具有非常高的紧凑性、耦合效率和品质因数等独特特性，在非线性光学领域备受关注。在本研究中，我们利用耦合模理论研究了具有克尔非线性的微环塔（MRT）中的光学双稳性，并证明了结构中适当的缺陷如何导致低阈值双稳性。特别是，我们通过数值计算在总损耗约为0.01 mm的结构中观察到了开关功率低至165 μW的非线性缺陷模式中的光学双稳性。此外，我们还开发了一个解析模型，该模型能很好地给出线性区域中缺陷模式的位置。
